Vehicles are scattered on the I-35 West bridge between Minneapolis and St. Paul after it collapsed into the Mississippi River on Aug. 1, 2007, sending dozens of cars into the river and killing 13 persons. (AP Photo/The Minnesota Daily/Stacy Bengs)

The deadly collapse in August of Minneapolis' Interstate I-35 West bridge over the Mississippi River tragically underscored the condition of the nation's highways, dams, wastewater treatment systems, electrical transmission networks and other infrastructure. Many facilities and systems are 50-100 years old, and engineers say they have been woefully neglected. Decades ago taxpayers, lawmakers and private companies found it relatively easy to ante up the huge sums needed to build vital infrastructure, but money for repairs and maintenance has been far tougher to come by in recent years. Federal and state lawmakers today often prefer to spend public dollars on high-profile convention centers and sports arenas, and anti-tax groups often fight tax hikes or utility-rate increases to pay for maintenance. But now lawmakers are debating whether aging infrastructure merits higher taxes or other measures, such as turning more highways into privately run toll roads.